Tuning of the emission frequency of ring Nd3+ : YAG chip lasers

Piezoelectric tuning of the emission frequency was achieved in monolithic ring Nd³⁺: YAG laser with a nonplanar cavity. The maximum tuning range was 2.3 GHz when the ray-contour perimeter was 30 mm. Under conditions of resonant modulation of mechanical stresses the rate of tuning could reach 35 MHz/V. Qualitative estimates were obtained of the contributions made to the change in the Nd³⁺ : YAG emission frequency by the deformation of the ray contour and by the photoelasticity effect when the Nd³⁺: YAG crystal was mechanically stressed.